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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
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<body>
<script>
window.onload=function(){
	var txt=document.getElementById('txt');
	//1.
	//txt.value='123';
	//2.
	//txt['value']='abc';
	//3.setAttribute(名称,值)
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	//4.getAttribute(名称)
	alert(txt.getAttribute('id'))
	
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};
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<input type="text" id="txt" />

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